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Is sound "additive"?

If I kept adding speakers playing at say, 70 db to a particular room, would the sound keep increasing? Wierd question, but I was thinking about how it sounds when a room fills up and people are talking -- it just gets louder and louder (though some of this is can be attributed to people speaking louder to compensate for others' talking). I was going to try and relate this to the effect (in SPL) of adding multiple subs to a room. Would it just keep getting louder and louder?
felthove
sedond
1,391 posts
 
btw, the proper reason to use two subs in a system instead of one, is *not* to increase the spl of the bass - this wood only make the sound too bass-heavy in relation to your monitors. as said before, a second sub allows the *same* spl's w/reduced distortion, as well as improving imaging/soundstaging.

doug s.

liguy
228 posts
 
Sedond, agreed! I was only pointing out that the answer to the question is not simple. In order for sound to be perfectly additive they must be exactlt in phase. If they are a degree or 2 different the sum will be different. I made no attempt to relate this to a subwoofer.
sedond
1,391 posts
 
liguy, i have no disagreements w/yer last comment... ;~)

regards, doug s.

liguy
228 posts
 
Thank you Sedond. You are a gentleman and a scholar.
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